Monoazo dye.



' No Drawing.

UNITED STATES PATENT onrron.

HUGO SCHWEITZER, or nnnnnrnm, AND ARTHUR znrvr, or voHwI'NKELf NEARELB'ERFELD, GERMANY, ASSIGNORS T0 FARBENFABRIKEN vomvr. FRIEDR. BAYER &00., or ELBERFELD, GERMANY, A CORPORATION or GERMANY.

MONDAZQ DYE.

Specification of Letters Patent.

Application filed August 1, 1911. Serial No. 641,773.

Patented Nov. 28, 1911.

To all whom it may concern:

Be it known that we, HUGO SOHWEITZER and ARTHUR ZART, doctors ofphilosophy,

chemists, citizens of the German Empire, re

siding, respectively, at Elberfeld and Vohwinkel, near Elberfeld,Germany, have invented new and useful Improvements in New Monoazo Dye,of which the following is a specification.

The present invention relates to the manufacture and production of newazo coloring s0,H t NH soar1 l a I I H (in The new dyes having mostprobably the formula:

d eing cotton from reddish-violet to bluishvloletshades which on beingdeveloped with diazotized para nitranilin change into v shades fast towashing and capable of being discharged to a pure white.

The following example may further illustrate the invention, the partsbeing by weight :239 parts (1' mol.) 'of 2-amino-5- naphthol-7-sulfonicacid are diazotized with 70 parts of sodium nitrite and hydrochloricacid and combined with 461 parts of the 5.5-dioxy-2.2 dinaphthylamin 7.7disulfonic acid containing an excess of sodium bicarbonate. The mixtureis heated and the dye is salted out with common salt, filtered oil anddried.

The new dye having most probably the formula:

is in the shape of its sodium salt a dark powder which is easily solublein water with a reddish-violet coloration and which is soluble'inconcentrated sulfuric acid with a violet coloration. Upon reduction withstannous chlorid and hydrochloric acid it is split up into6-amino-5.5-dioxy-2.2-dinaphthylamin-7.7'-disulfonic acid and2.5.7-amin0- naphthol sulfonic acid. It dyes cotton reddish-violet. Theshade after being developed with diazotized para-nitranilin isbluish-violet fast to washing. It can be discharged to a-pure white.

We claim 1. The herein described new monoazo dyestufi's having mostprobably the formula:

which are after being dried and pulverized in the shape of their.alkaline salts dark powders soluble in water; yielding upon reductionwith stannous chlorid and hydrochloric acid an aminona hthol sulfonicacid and a compound of the ormula:

. H dyeing cotton from reddish-violet to bluishviolet shades whiehonbeing developed with diazotized para-nitrunilin change into shades fastto washing and capable of being discharged to a, pure white,substantially as de: scribed.

2. The herein described-new dye having most (probably the formula:

whichis after being dried and the shape of its sodium salt'a dark powdersoluble in concentrated sulfuric acid with a violet colorationryielding.upon reduction [sun] 1 pulverized vin error appears in the'printedspecification requiring correction as follows:

Patent should be reed: with this correction therein that the same nmythe record if the casein the Patent ()flice, I

i afld sealed this 6th day of February, A. D., 1912.

disulfonic aohl; dyeing cotton reddish-violet,

which shade after being developed with diazotized para-nitrnnilin isbluish-violet fast to washing which can be discharged to a pure white,substantially as described.

In testimony whereof We have hereunto set our hands' in the presence oftwo'subscribing witnesses HUGO SCHWEI'TZ 1 112.. ARTllU R ZART.

Witnesses I Inns. J. l/Vnten'r, Annm'rr l Nuunn.

' It is hereby certified thetin Letters Patent No. 1,009,796, grantedNovember 28, f 1911, upon the-application of Hugo Schweitzer, ofElhert'eld, and Arthur Zart, of

w v i l I 'vohwmkel, near lalberteld,Germany, for an Improvement mMonoazo Dye, n11

e .l Ago .5,

.li 10,'f mul Symbol N H" read N end that the said lmtters conform to o.0. BILLINGS,

Act (Pug Uommz'ssioner of Patents.

violet shades whiehon being developed with diazotized para-nitrunilinchange into shades fast to washing and capable of being discharged to a,pure white, substantially as de: scribed.

2. The herein described-new dye having most (probably the formula:

whichis after being dried and the shape of its sodium salt'a dark powdersoluble in concentrated sulfuric acid with a violet colorationryielding.upon reduction [sun] 1 pulverized vin error appears in the'printedspecification requiring correction as follows:

Patent should be reed: with this correction therein that the same nmythe record if the casein the Patent ()flice, I

i afld sealed this 6th day of February, A. D., 1912.

disulfonic aohl; dyeing cotton reddish-violet,

which shade after being developed with diazotized para-nitrnnilin isbluish-violet fast to washing which can be discharged to a pure white,substantially as described.

In testimony whereof We have hereunto set our hands' in the presence oftwo'subscribing witnesses HUGO SCHWEI'TZ 1 112.. ARTllU R ZART.

Witnesses I Inns. J. l/Vnten'r, Annm'rr l Nuunn.

' It is hereby certified thetin Letters Patent No. 1,009,796, grantedNovember 28, f 1911, upon the-application of Hugo Schweitzer, ofElhert'eld, and Arthur Zart, of

w v i l I 'vohwmkel, near lalberteld,Germany, for an Improvement mMonoazo Dye, n11

e .l Ago .5,

.li 10,'f mul Symbol N H" read N end that the said lmtters conform to o.0. BILLINGS,

Act (Pug Uommz'ssioner of Patents.

Correction in Letters PateiitNo.

It is hereby cm'tilind 7 i911, upon the application of Hugo VohWinkei,near Eiberfeld, Germany error iippem's in the printed line 10, formula,for t 'Signcj and sealed this 6th [SEAL] that in Letters Patent No.1,009,796,

specification: requiring he symboi N=H" read A: 1V; and that the Patentshould he read with this correction the record of the case inthc Patmlt()flicu.

. day of February, A. 1)., i912.

gmntvd Novvmhm 2H. lhori'eid, and Arthur Kart 01' foian improvement in-Monoazu by corrcrtiun as f'oiinwa: Page J,

said iii-{turn i miui'm In therein that tho name may 0. C. BILLING-5,Actng Commissioner of Pale-1111s.

